Safety razor



Nov. y10, 1936. J. MUROS 2,060,520

SAFETY RAZOR Filed Oct. 16, 1935 2 Shee'cS-Sheefl 1- J. MURos v SAFETY RAZOR Nov. l0, 1936.

2 Sheets-Sheet 2 l/w vena? wieg' Patented Nov. 10, 1936 PATENT OFFICE SAFETY RAZOR Joseph Muros, Belmont, Mass., assignor to Gillette Safety Razor Company, Boston, Mass., a corporation of Delaware Application October 16, 1935, Serial No. 45,299

6 Claims.

This invention relates to safety razors of the type employing a sectional cap in combination with an actuating member connected to the cap sections and movable to swing them simultaneously toward or from blade-clamping position. An example of such a razor is to be found in my own prior Patent No. 1,992,038.

The object of the present invention is to simplify the mechanism for swinging the cap sections and for rapidly moving the blade supporting member in the razor to flex and clamp the blade. As herein shown, the cap sections are pivotally mounted by supporting arms in the razor head and are connected to a common actuating member which in this case comprises a blade supporting plate having connections for swinging the cap sections simultaneously. A compact and effective connection is produced, as herein shown, by providing the cap sections andthe blade supporting plate with parallel adjacent arms and providing an angular cam slot in one set of arms and a cam pin in the co-operating set of arms. The cam slot may be designed to impart a rapid closing movement to the cap sections during the initial movement of the actuating plate and then to hold the cap sections in closed position during the iinal blade-clamping movement of the plate. Each cap section is further shown as equipped with a guard member which is movable in an arcuate path away from the blade when the cap section is swung into open position, thus leaving the blade in a particularly open and easily-accessible position for removal or replacement.

Another feature of the invention resides in novel mechanism for imparting rapid and light movement to the cap sections. As herein shown, this mechanism comprises a double-threaded member arranged to be rotated by the user for imparting a high speed differential movement to the actuating plate. This construction offers a compact reliable mechanism capable of convenient manipulation and of light weight and is, therefore, highly desirable in the construction of an improved safety razor.

These and other features of the invention will be best understood and appreciated from the following description oi a preferred embodiment thereof, selected for purposes'of illustration and shown in the accompanying drawings, in which:-

Fig. l is a view in perspective on an enlarged scale of the razor in closed position;

Fig. 2 is a view of the razor in vertical crosssection;

Fig. 3 is a view of the razor head in cross-section at right angles to that shown in Fig. 2;

Fig. 4 is a view of the razor in vertical crosssection showing the cap sections closed and the blade supporting plate in mid position;

Fig. 5 is a similar view showing the cap sections in open position; and

Fig. 6 is a plan view of the razor head.

In the preferred embodiment of the present invention the frame of the razor includes an elon- 10 gated plate I0 having end flanges II turned up at right angles to the body of the plate. The cap sections l2, each provided with downwardly extending arms I3, are pivotally mounted by pivot pins I4 between the opposite ends oi' the end l anges I I of the razor head. Each of the cap sections, in addition to its blade engaging portion, is provided with a bar guard I5 outwardly convex in shape and located slightly beneath and in ad Vance of the cutting edge of the blade. The bar 20 guard I5 is separated from the body of the cap section by an elongated opening through which the edge of the blade projects when clamped in shaving position. Each cap section arm I3 also carries a short inwardly extending cam pin I 6 25 whose function will be presently explained.

In the razor illustrated, the functions of the blade carrier and the actuating device for the cap sections are combined in an elongated plate I 'I which, in the open position of the razor, lies be- 30 tween the end iianges II and is provided at each corner with a downwardly extending arm provided with an angle cam slot I8. The arms of the blade carrier plate I1 lie inside the corresponding arms I3 of the cap sections and in sliding contact therewith and one of the cam pins I 6 on each cap section arm projects into the cam slot and is controlled in its position by the movement of the cam slot with the blade carrier plate 40 Il. The carrier plate is also provided in its upper face with a pair of upwardly projecting studs I9 herein shown as being of diamond-shaped contour and adapted to fit in correspondingly shaped blade apertures to locate a blade accurately in 45 position upon the blade carrier Il. The plate itself is rigidly mounted upon the upper end of a stem 20 which projects downwardly into the handle of the razor and is threaded at its lower end.

A blade 2| is shown in position upon the blade 5 0 carrier in Figs. 1 to 4 and it will be understood that the blade is perforated to fit upon the studs I9 and provided with corner recesses dening elongated unsharpened portions at each end of 55 the blade which project slightly beyond the ends of the cap sections I2.

The razor head includes a neck 22 circular in cross-section and rigidly secured to the elongated plate Ill of the arm. The neck is provided at its lower end with a centrally disposed bor-e 23 internally threaded at its lower end. The neck is shouldered to receive the barrel 25 of the handle and within the barrel is disposed an elongated nut 24 reduced in diameter at its upper end and threaded into the bore of the neck 22. The nut is also provided with a centrally disposed bore which is threaded to receive the end of the blade carrier stem 2Q. Both threads are therein shown as left-hand threads and the result is that when the user turns the nut 24 toward the right the stem 28 will be elevated in a rapid diierential movement equaling the combined pitch of the two threads. When the nut is turned in a lefthand direction the stem ZI) will be lowered at a correspondingly rapid rate.

Assuming now that the razor is clamped in shaving position as shown in Fig. 2 and that the user desires to open the razor for purposes of replacing or cleaning the blade, in turning the nut 24 to the left he rst lowers the blade carrier I1 from the position shown in Fig. 2 to the position shown in Fig. 4, releasing the blade from the pressure of the cap sections I2 and permitting it to assume a flat position. In this movement the vertical portions of the cam slot I8 travels downwardly with respect to the cam pins I6 and no swinging movement is imparted to the cap sections I2. However, as the downward movement of the plate I'I is continued the horizontal portion of the cam slots I8 cornes into play and the pins IG are forced to move inwardly beneath the pivotal axis of the cap section which are, therefore, swung rapidly outwardly into their wide open position, as shown in Fig. 5. In this position, the face of the blade carrier I'I is fuly exposed and the blade may be conveniently removed or replaced. When it is again desired to close the razor and clamp the blade in shaving position the nut 24 is turned in a right-hand direction whereupon the cams of the carrier plate act first to swing the cap sections into closed position, as shown in Fig. 4 and then to hold them in this position while the carrier plate completes its upward movement clamping the blade against the inner concave surface of the cap sections I2.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A safety razor having, in combination, a stationary support, cap sections pivotally mounted thereon, a movable blade-supporting plate and an angle slot and pin connection between said plate and the cap sections, whereby, in the upward movement of the plate the cap sections are rst closed and then locked in closed position by said connection.

2. A safety razor having, in combination, a

stationary support, cap sections pivotally mounted thereon through the medium of downwardly extending arms, and a vertically movable bladesupporting plate having arms with right angle cam slots therein disposed adjacent to the arms of the cap sections, and cam pins projecting from the arms of the cap sections into said slots and movable therein first to swing and then to lock the sections.

3. A safety razor having, in combination, a support with stationary cross arms, cap sections with downwardly extending arms at each end which are pivotally connected to said cross arms, and a blade-supporting plate vertically movable between said cross arms and having angular cam slots therein which are so connected to the arms of the cap sections as to swing and lock the sections in closing the razor.

4. In a safety razor, a cap comprising separate, relatively movable, co-operating sections each formed with a guard member therein and mounted to swing about an axis outside the guard member.

5. A safety razor having a blade-supporting member, cap sections pivotally mounted respectively to swing about axes parallel to and remote from the edges of a blade on said support and each having a bar guard defining a slot in the cap arranged to receive a blade edge when the cap sections are closed.

6. A safety razor having a blade-supporting member, co-operating blade-clamping sections mounted respectively to swing about axes located beneath said member and each having a guard movable bodily toward or away from the edge of a blade on the support when the section is swung about its axis.

JOSEPH MUROS. 

